package com.chinathinks.core.net.smtp;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Enumeration;
import java.util.Vector;

import com.chinathinks.core.net.MalformedServerReplyException;
import com.chinathinks.core.net.ProtocolCommandListener;
import com.chinathinks.core.net.ProtocolCommandSupport;
import com.chinathinks.core.net.SocketClient;

/***
 * SMTP provides the basic the functionality necessary to implement your own
 * SMTP client. To derive the full benefits of the SMTP class requires some
 * knowledge of the FTP protocol defined in RFC 821. However, there is no reason
 * why you should have to use the SMTP class. The
 * {@link org.apache.commons.net.smtp.SMTPClient} class, derived from SMTP,
 * implements all the functionality required of an SMTP client. The SMTP class
 * is made public to provide access to various SMTP constants and to make it
 * easier for adventurous programmers (or those with special needs) to interact
 * with the SMTP protocol and implement their own clients. A set of methods with
 * names corresponding to the SMTP command names are provided to facilitate this
 * interaction.
 * <p>
 * You should keep in mind that the SMTP server may choose to prematurely close
 * a connection for various reasons. The SMTP class will detect a premature SMTP
 * server connection closing when it receives a
 * {@link org.apache.commons.net.smtp.SMTPReply#SERVICE_NOT_AVAILABLE
 * SMTPReply.SERVICE_NOT_AVAILABLE } response to a command. When that occurs,
 * the SMTP class method encountering that reply will throw an
 * {@link org.apache.commons.net.smtp.SMTPConnectionClosedException} .
 * <code>SMTPConectionClosedException</code> is a subclass of
 * <code> IOException </code> and therefore need not be caught separately, but
 * if you are going to catch it separately, its catch block must appear before
 * the more general <code> IOException </code> catch block. When you encounter
 * an {@link org.apache.commons.net.smtp.SMTPConnectionClosedException} , you
 * must disconnect the connection with
 * {@link org.apache.commons.net.SocketClient#disconnect disconnect() } to
 * properly clean up the system resources used by SMTP. Before disconnecting,
 * you may check the last reply code and text with {@link #getReplyCode
 * getReplyCode }, {@link #getReplyString getReplyString }, and
 * {@link #getReplyStrings getReplyStrings}.
 * <p>
 * Rather than list it separately for each method, we mention here that every
 * method communicating with the server and throwing an IOException can also
 * throw a {@link org.apache.commons.net.MalformedServerReplyException} , which
 * is a subclass of IOException. A MalformedServerReplyException will be thrown
 * when the reply received from the server deviates enough from the protocol
 * specification that it cannot be interpreted in a useful manner despite
 * attempts to be as lenient as possible.
 * <p>
 * <p>
 * 
 * @author Daniel F. Savarese
 * @see SMTPClient
 * @see SMTPConnectionClosedException
 * @see org.apache.commons.net.MalformedServerReplyException
 ***/

public class SMTP extends SocketClient {
	/*** The default SMTP port (25). ***/
	public static final int DEFAULT_PORT = 25;

	// We have to ensure that the protocol communication is in ASCII
	// but we use ISO-8859-1 just in case 8-bit characters cross
	// the wire.
	private static final String __DEFAULT_ENCODING = "ISO-8859-1";

	private StringBuffer __commandBuffer;

	BufferedReader _reader;
	BufferedWriter _writer;
	int _replyCode;
	Vector _replyLines;
	boolean _newReplyString;
	String _replyString;

	/***
	 * A ProtocolCommandSupport object used to manage the registering of
	 * ProtocolCommandListeners and te firing of ProtocolCommandEvents.
	 ***/
	protected ProtocolCommandSupport _commandSupport_;

	/***
	 * The default SMTP constructor. Sets the default port to
	 * <code>DEFAULT_PORT</code> and initializes internal data structures for
	 * saving SMTP reply information.
	 ***/
	public SMTP() {
		setDefaultPort(DEFAULT_PORT);
		__commandBuffer = new StringBuffer();
		_replyLines = new Vector();
		_newReplyString = false;
		_replyString = null;
		_commandSupport_ = new ProtocolCommandSupport(this);
	}

	private int __sendCommand(String command, String args, boolean includeSpace) throws IOException {
		String message;

		__commandBuffer.setLength(0);
		__commandBuffer.append(command);

		if (args != null) {
			if (includeSpace)
				__commandBuffer.append(' ');
			__commandBuffer.append(args);
		}

		__commandBuffer.append(SocketClient.NETASCII_EOL);

		_writer.write(message = __commandBuffer.toString());
		_writer.flush();

		if (_commandSupport_.getListenerCount() > 0)
			_commandSupport_.fireCommandSent(command, message);

		__getReply();
		return _replyCode;
	}

	private int __sendCommand(int command, String args, boolean includeSpace) throws IOException {
		return __sendCommand(SMTPCommand._commands[command], args, includeSpace);
	}

	private void __getReply() throws IOException {
		int length;

		_newReplyString = true;
		_replyLines.setSize(0);

		String line = _reader.readLine();

		if (line == null)
			throw new SMTPConnectionClosedException("Connection closed without indication.");

		// In case we run into an anomaly we don't want fatal index exceptions
		// to be thrown.
		length = line.length();
		if (length < 3)
			throw new MalformedServerReplyException("Truncated server reply: " + line);

		try {
			String code = line.substring(0, 3);
			_replyCode = Integer.parseInt(code);
		} catch (NumberFormatException e) {
			throw new MalformedServerReplyException("Could not parse response code.\nServer Reply: " + line);
		}

		_replyLines.addElement(line);

		// Get extra lines if message continues.
		if (length > 3 && line.charAt(3) == '-') {
			do {
				line = _reader.readLine();

				if (line == null)
					throw new SMTPConnectionClosedException("Connection closed without indication.");

				_replyLines.addElement(line);

				// The length() check handles problems that could arise from
				// readLine()
				// returning too soon after encountering a naked CR or some
				// other
				// anomaly.
			} while (!(line.length() >= 4 && line.charAt(3) != '-' && Character.isDigit(line.charAt(0))));
			// This is too strong a condition because a non-conforming server
			// could screw things up like ftp.funet.fi does for FTP
			// line.startsWith(code)));
		}

		if (_commandSupport_.getListenerCount() > 0)
			_commandSupport_.fireReplyReceived(_replyCode, getReplyString());

		if (_replyCode == SMTPReply.SERVICE_NOT_AVAILABLE)
			throw new SMTPConnectionClosedException("SMTP response 421 received.  Server closed connection.");
	}

	/*** Initiates control connections and gets initial reply. ***/
	protected void _connectAction_() throws IOException {
		super._connectAction_();
		_reader = new BufferedReader(new InputStreamReader(_input_, __DEFAULT_ENCODING));
		_writer = new BufferedWriter(new OutputStreamWriter(_output_, __DEFAULT_ENCODING));
		__getReply();
	}

	/***
	 * Adds a ProtocolCommandListener. Delegates this task to
	 * {@link #_commandSupport_ _commandSupport_ }.
	 * <p>
	 * 
	 * @param listener
	 *            The ProtocolCommandListener to add.
	 ***/
	public void addProtocolCommandListener(ProtocolCommandListener listener) {
		_commandSupport_.addProtocolCommandListener(listener);
	}

	/***
	 * Removes a ProtocolCommandListener. Delegates this task to
	 * {@link #_commandSupport_ _commandSupport_ }.
	 * <p>
	 * 
	 * @param listener
	 *            The ProtocolCommandListener to remove.
	 ***/
	public void removeProtocolCommandistener(ProtocolCommandListener listener) {
		_commandSupport_.removeProtocolCommandListener(listener);
	}

	/***
	 * Closes the connection to the SMTP server and sets to null some internal
	 * data so that the memory may be reclaimed by the garbage collector. The
	 * reply text and code information from the last command is voided so that
	 * the memory it used may be reclaimed.
	 * <p>
	 * 
	 * @exception IOException
	 *                If an error occurs while disconnecting.
	 ***/
	public void disconnect() throws IOException {
		super.disconnect();
		_reader = null;
		_writer = null;
		_replyString = null;
		_replyLines.setSize(0);
		_newReplyString = false;
	}

	/***
	 * Sends an SMTP command to the server, waits for a reply and returns the
	 * numerical response code. After invocation, for more detailed information,
	 * the actual reply text can be accessed by calling {@link #getReplyString
	 * getReplyString } or {@link #getReplyStrings getReplyStrings }.
	 * <p>
	 * 
	 * @param command
	 *            The text representation of the SMTP command to send.
	 * @param args
	 *            The arguments to the SMTP command. If this parameter is set to
	 *            null, then the command is sent with no argument.
	 * @return The integer value of the SMTP reply code returned by the server
	 *         in response to the command.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int sendCommand(String command, String args) throws IOException {
		return __sendCommand(command, args, true);
	}

	/***
	 * Sends an SMTP command to the server, waits for a reply and returns the
	 * numerical response code. After invocation, for more detailed information,
	 * the actual reply text can be accessed by calling {@link #getReplyString
	 * getReplyString } or {@link #getReplyStrings getReplyStrings }.
	 * <p>
	 * 
	 * @param command
	 *            The SMTPCommand constant corresponding to the SMTP command to
	 *            send.
	 * @param args
	 *            The arguments to the SMTP command. If this parameter is set to
	 *            null, then the command is sent with no argument.
	 * @return The integer value of the SMTP reply code returned by the server
	 *         in response to the command.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int sendCommand(int command, String args) throws IOException {
		return sendCommand(SMTPCommand._commands[command], args);
	}

	/***
	 * Sends an SMTP command with no arguments to the server, waits for a reply
	 * and returns the numerical response code. After invocation, for more
	 * detailed information, the actual reply text can be accessed by calling
	 * {@link #getReplyString getReplyString } or {@link #getReplyStrings
	 * getReplyStrings }.
	 * <p>
	 * 
	 * @param command
	 *            The text representation of the SMTP command to send.
	 * @return The integer value of the SMTP reply code returned by the server
	 *         in response to the command.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int sendCommand(String command) throws IOException {
		return sendCommand(command, null);
	}

	/***
	 * Sends an SMTP command with no arguments to the server, waits for a reply
	 * and returns the numerical response code. After invocation, for more
	 * detailed information, the actual reply text can be accessed by calling
	 * {@link #getReplyString getReplyString } or {@link #getReplyStrings
	 * getReplyStrings }.
	 * <p>
	 * 
	 * @param command
	 *            The SMTPCommand constant corresponding to the SMTP command to
	 *            send.
	 * @return The integer value of the SMTP reply code returned by the server
	 *         in response to the command.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int sendCommand(int command) throws IOException {
		return sendCommand(command, null);
	}

	/***
	 * Returns the integer value of the reply code of the last SMTP reply. You
	 * will usually only use this method after you connect to the SMTP server to
	 * check that the connection was successful since <code> connect </code> is
	 * of type void.
	 * <p>
	 * 
	 * @return The integer value of the reply code of the last SMTP reply.
	 ***/
	public int getReplyCode() {
		return _replyCode;
	}

	/***
	 * Fetches a reply from the SMTP server and returns the integer reply code.
	 * After calling this method, the actual reply text can be accessed from
	 * either calling {@link #getReplyString getReplyString } or
	 * {@link #getReplyStrings getReplyStrings }. Only use this method if you
	 * are implementing your own SMTP client or if you need to fetch a secondary
	 * response from the SMTP server.
	 * <p>
	 * 
	 * @return The integer value of the reply code of the fetched SMTP reply.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while receiving the server reply.
	 ***/
	public int getReply() throws IOException {
		__getReply();
		return _replyCode;
	}

	/***
	 * Returns the lines of text from the last SMTP server response as an array
	 * of strings, one entry per line. The end of line markers of each are
	 * stripped from each line.
	 * <p>
	 * 
	 * @return The lines of text from the last SMTP response as an array.
	 ***/
	public String[] getReplyStrings() {
		String[] lines;
		lines = new String[_replyLines.size()];
		_replyLines.copyInto(lines);
		return lines;
	}

	/***
	 * Returns the entire text of the last SMTP server response exactly as it
	 * was received, including all end of line markers in NETASCII format.
	 * <p>
	 * 
	 * @return The entire text from the last SMTP response as a String.
	 ***/
	public String getReplyString() {
		Enumeration en;
		StringBuffer buffer;

		if (!_newReplyString)
			return _replyString;

		buffer = new StringBuffer(256);
		en = _replyLines.elements();
		while (en.hasMoreElements()) {
			buffer.append((String) en.nextElement());
			buffer.append(SocketClient.NETASCII_EOL);
		}

		_newReplyString = false;

		return (_replyString = buffer.toString());
	}

	/***
	 * A convenience method to send the SMTP HELO command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param hostname
	 *            The hostname of the sender.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int helo(String hostname) throws IOException {
		return sendCommand(SMTPCommand.HELO, hostname);
	}

	/***
	 * A convenience method to send the SMTP MAIL command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param reversePath
	 *            The reverese path.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int mail(String reversePath) throws IOException {
		return __sendCommand(SMTPCommand.MAIL, reversePath, false);
	}

	/***
	 * A convenience method to send the SMTP RCPT command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param forwardPath
	 *            The forward path.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int rcpt(String forwardPath) throws IOException {
		return __sendCommand(SMTPCommand.RCPT, forwardPath, false);
	}

	/***
	 * A convenience method to send the SMTP DATA command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int data() throws IOException {
		return sendCommand(SMTPCommand.DATA);
	}

	/***
	 * A convenience method to send the SMTP SEND command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param reversePath
	 *            The reverese path.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int send(String reversePath) throws IOException {
		return sendCommand(SMTPCommand.SEND, reversePath);
	}

	/***
	 * A convenience method to send the SMTP SOML command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param reversePath
	 *            The reverese path.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int soml(String reversePath) throws IOException {
		return sendCommand(SMTPCommand.SOML, reversePath);
	}

	/***
	 * A convenience method to send the SMTP SAML command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param reversePath
	 *            The reverese path.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int saml(String reversePath) throws IOException {
		return sendCommand(SMTPCommand.SAML, reversePath);
	}

	/***
	 * A convenience method to send the SMTP RSET command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int rset() throws IOException {
		return sendCommand(SMTPCommand.RSET);
	}

	/***
	 * A convenience method to send the SMTP VRFY command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param user
	 *            The user address to verify.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int vrfy(String user) throws IOException {
		return sendCommand(SMTPCommand.VRFY, user);
	}

	/***
	 * A convenience method to send the SMTP VRFY command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param name
	 *            The name to expand.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int expn(String name) throws IOException {
		return sendCommand(SMTPCommand.EXPN, name);
	}

	/***
	 * A convenience method to send the SMTP HELP command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int help() throws IOException {
		return sendCommand(SMTPCommand.HELP);
	}

	/***
	 * A convenience method to send the SMTP HELP command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @param command
	 *            The command name on which to request help.
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int help(String command) throws IOException {
		return sendCommand(SMTPCommand.HELP, command);
	}

	/***
	 * A convenience method to send the SMTP NOOP command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int noop() throws IOException {
		return sendCommand(SMTPCommand.NOOP);
	}

	/***
	 * A convenience method to send the SMTP TURN command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int turn() throws IOException {
		return sendCommand(SMTPCommand.TURN);
	}

	/***
	 * A convenience method to send the SMTP QUIT command to the server, receive
	 * the reply, and return the reply code.
	 * <p>
	 * 
	 * @return The reply code received from the server.
	 * @exception SMTPConnectionClosedException
	 *                If the SMTP server prematurely closes the connection as a
	 *                result of the client being idle or some other reason
	 *                causing the server to send SMTP reply code 421. This
	 *                exception may be caught either as an IOException or
	 *                independently as itself.
	 * @exception IOException
	 *                If an I/O error occurs while either sending the command or
	 *                receiving the server reply.
	 ***/
	public int quit() throws IOException {
		return sendCommand(SMTPCommand.QUIT);
	}

}

/*
 * Emacs configuration Local variables: ** mode: java ** c-basic-offset: 4 **
 * indent-tabs-mode: nil ** End: **
 */
